The Perfect Glass

If you have children, you must have wondered, while drying the table for the (…)th (Please insert the age of your older son, multiplied by 365, multiplied by 3 meals, multiplied by the number of your sons), why glasses are generally designed this way

(Glass kind courtesy of Blue Ginger - Milan)

…and not this way???

OK, OK, you’ll say: “That’s because it is difficult to handle”.
Got it. OK. So, let’s rework it:

But, Holy Cow, this would be way more difficult to spill!!!
Must I solve all problems by myself?